How to split a comma-separated string?
JavaStringSplitJava Problem Overview
I have a String with an unknown length that looks something like this
"dog, cat, bear, elephant, ..., giraffe"
What would be the optimal way to divide this string at the commas so each word could become an element of an ArrayList?
For example
List<String> strings = new ArrayList<Strings>();
// Add the data here so strings.get(0) would be equal to "dog",
// strings.get(1) would be equal to "cat" and so forth.
Java Solutions
Solution 1 - Java
You could do this:
String str = "...";
List<String> elephantList = Arrays.asList(str.split(","));
Basically the .split()
method will split the string according to (in this case) delimiter you are passing and will return an array of strings.
However, you seem to be after a List of Strings rather than an array, so the array must be turned into a list by using the Arrays.asList()
utility. Just as an FYI you could also do something like so:
String str = "...";
ArrayList<String> elephantList = new ArrayList<>(Arrays.asList(str.split(","));
But it is usually better practice to program to an interface rather than to an actual concrete implementation, so I would recommend the 1st option.
Solution 2 - Java
Well, you want to split, right?
String animals = "dog, cat, bear, elephant, giraffe";
String[] animalsArray = animals.split(",");
If you want to additionally get rid of whitespaces around items:
String[] animalsArray = animals.split("\\s*,\\s*");
Solution 3 - Java
You can split it and make an array then access like an array:
String names = "prappo,prince";
String[] namesList = names.split(",");
You can access it with its indexes
String name1 = namesList [0];
String name2 = namesList [1];
or using a loop
for(String name : namesList){
System.out.println(name);
}
Solution 4 - Java
A small improvement: above solutions will not remove leading or trailing spaces in the actual String. It's better to call trim before calling split. Instead of this,
String[] animalsArray = animals.split("\\s*,\\s*");
use
String[] animalsArray = animals.trim().split("\\s*,\\s*");
Solution 5 - Java
First you can split names like this
String animals = "dog, cat, bear, elephant,giraffe";
String animals_list[] = animals.split(",");
to Access your animals
String animal1 = animals_list[0];
String animal2 = animals_list[1];
String animal3 = animals_list[2];
String animal4 = animals_list[3];
And also you want to remove white spaces and comma around animal names
String animals_list[] = animals.split("\\s*,\\s*");
Solution 6 - Java
For completeness, using the Guava library, you'd do: Splitter.on(",").split(“dog,cat,fox”)
Another example:
String animals = "dog,cat, bear,elephant , giraffe , zebra ,walrus";
List<String> l = Lists.newArrayList(Splitter.on(",").trimResults().split(animals));
// -> [dog, cat, bear, elephant, giraffe, zebra, walrus]
Splitter.split()
returns an Iterable, so if you need a List, wrap it in Lists.newArrayList()
as above. Otherwise just go with the Iterable, for example:
for (String animal : Splitter.on(",").trimResults().split(animals)) {
// ...
}
Note how trimResults()
handles all your trimming needs without having to tweak regexes for corner cases, as with String.split()
.
If your project uses Guava already, this should be your preferred solution. See Splitter documentation in Guava User Guide or the javadocs for more configuration options.
Solution 7 - Java
Can try with this worked for me
sg = sg.replaceAll(", $", "");
or else
if (sg.endsWith(",")) {
sg = sg.substring(0, sg.length() - 1);
}
Solution 8 - Java
in build.gradle add Guava
compile group: 'com.google.guava', name: 'guava', version: '27.0-jre'
and then
public static List<String> splitByComma(String str) {
Iterable<String> split = Splitter.on(",")
.omitEmptyStrings()
.trimResults()
.split(str);
return Lists.newArrayList(split);
}
public static String joinWithComma(Set<String> words) {
return Joiner.on(", ").skipNulls().join(words);
}
enjoy :)
Solution 9 - Java
Easy and Short solution:-
> String str="test 1 ,test 2 , test 3";
>
>
> List
It will working for all cases.
Thanks me later :-)
Solution 10 - Java
Remove all white spaces and create an fixed-size or immutable List (See asList
API docs)
final String str = "dog, cat, bear, elephant, ..., giraffe";
List<String> list = Arrays.asList(str.replaceAll("\\s", "").split(","));
// result: [dog, cat, bear, elephant, ..., giraffe]
It is possible to also use replaceAll(\\s+", "")
but maximum efficiency depends on the use case. (see @GurselKoca answer to Removing whitespace from strings in Java)
Solution 11 - Java
You can use something like this:
String animals = "dog, cat, bear, elephant, giraffe";
List<String> animalList = Arrays.asList(animals.split(","));
Also, you'd include the libs:
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
Solution 12 - Java
Use this :
List<String> splitString = (List<String>) Arrays.asList(jobtype.split(","));
Solution 13 - Java
In Kotlin,
val stringArray = commasString.replace(", ", ",").split(",")
where stringArray
is List<String>
and commasString
is String
with commas and spaces
Solution 14 - Java
This is an easy way to split string by comma,
import java.util.*;
public class SeparatedByComma{
public static void main(String []args){
String listOfStates = "Hasalak, Mahiyanganaya, Dambarawa, Colombo";
List<String> stateList = Arrays.asList(listOfStates.split("\\,"));
System.out.println(stateList);
}
}
Solution 15 - Java
"Old school" (JDK1.0) java.util Class StringTokenizer :
StringTokenizer(String str, String delim)
import java.util.*;
public class Tokenizer {
public static void main(String[] args) {
String str = "dog, cat, bear, elephant, ..., giraffe";
StringTokenizer tokenizer = new StringTokenizer(str, ",");
List<String> strings = new ArrayList<String>();
while (tokenizer.hasMoreTokens()) {
// if need to trim spaces .trim() or use delim like ", "
String token = tokenizer.nextToken().trim();
strings.add(token);
}
// test output
strings.forEach(System.out::println);
}
}
NB: StringTokenizer is a legacy class that is retained for compatibility reasons although its use is discouraged in new code. It is recommended that anyone seeking this functionality use the split method of String or the java.util.regex package instead.
Example:
import java.util.regex.*;
...
// Recommended method<?>
Pattern commaPattern = Pattern.compile("\\s*,\\s*");
String[] words = commaPattern.split(str);
List<String> wordList = new ArrayList<String>(Arrays.asList(words));
// test output
wordList.forEach(System.out::println);
...
Solution 16 - Java
There is a function called replaceAll()
that can remove all whitespaces by replacing them with whatever you want. As an example
String str=" 15. 9 4;16.0 1"
String firstAndSecond[]=str.replaceAll("\\s","").split(";");
System.out.println("First:"+firstAndSecond[0]+", Second:"+firstAndSecond[1]);
will give you:
First:15.94, Second:16.01